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I am running FreeBSD on one of my systems, but I only use packet filtering. I still have alot to learn about my FreeBSD system, so I can't get into alot of detail about it's firewall packages. The only reason I was able to provide any insight to this subject is because I have recently been reading the FreeBSD Handbook.

\"Those who profess to favor freedom, yet depreciate agitation, are men who want crops without plowing up the ground. They want rain without thunder and lightning. They want the ocean without the awful roar of its many waters. This struggle may be a moral one; or it may be a physical one; or it may be both moral and physical; but it must be a struggle. Power concedes nothing without a demand. It never did and it never will.\"

* Open Source software, available free of charge
* User friendly, easy to use, graphical interface
* A wizard walks you through setting up your firewall on your first time
* Suitable for use on desktops, servers and gateways
* Real-time firewall event monitor shows intrusion attempts as they happen
* Enables Internet connection sharing, optionally with DHCP service for the clients
* Allows you to define both inbound and outbound access policy
* Open or stealth ports, shaping your firewalling with just a few mouse clicks
* Enable port forwarding for your local network in just seconds
* Option to whitelist or blacklist traffic
* Real time firewall events view
* View active network connections, including any traffic routed through the firewall
* Advanced Linux kernel tuning features provide protection from flooding, broadcasting and spoofing
* Support for tuning ICMP parameters to stop Denial of Service (DoS) attacks
* Support for tuning ToS parameters to improve services for connected client computers
* Ability to hook up user defined scripts or rulesets before or after firewall activation
* Supports Linux Kernels 2.4 and 2.6
* Translations available for many languages (38 languages as of November 2004)